The fancy new takeoff performance software in the laptop uses the braking distance in its calculations.
Now if the laptop software also told the pilots that braking distance and if remaining distance signs were available for distances beyond 3000' where the first runway marks appear (for those cases where more than 3000' is required to stop from V1), the crew would know when the required braking distance came up before V1 that either the weight is wrong or that they did not obtain sufficient thrust at a point where they can get the a/c stopped before going off the end.
The software needs a number of variables, including aircraft weight, in order to calculate braking distance. Where does it get the weight? You guessed it - from pilot input! Different weight - different braking distance.
So this would not trap a pilot input error, as happened in Melbourne.